Generating system



C. WHITE.

GENERATING SYSTEM. APPLICATION FILED OCT. 23, 1918.

/H ve l i fak: fjdr/ea W/w'fe PatentedApr. 12, 1921.

UNITED STATES PATENT OFFICE.

CHARLES WHITE, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO IVESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

GEN ERATING SYSTEM.

Application filed October 23, 1918. Serial No. 259,366.

' To all whom it may concern:

Be it known that I, CHARLES Wrntrn, a citizen of the United States, residing at East Orange, in the county of Essex, State of New Jerse have invented certain new and useful mp'rovements in Generating Systems, of which the following is a full, clear, concise, and exact description.

This invention relates. to electrical gencrating systems and more particularly to such systems in which reserve sources of current are employed for signaling purposes.

In some telephone systems, especially those which are employed for composite telephone and telegraph service, remotely controlled sources of signallng current are frequently provided, In such instances it is extremely desirable to provide an alternative or reserve source ofcurrent which automatically will be made available upon the failure of the main source. In such cases it is also desirable that a suitable indication should be given, notifying the attendant of the substitution of the reserve source for the main source.

It is the object of this invention to pro vide an improved systemof this character which will be simple and inexpensive and reliable in its operation.

To attain this object, in accordance with a feature of the invention, switching means is provided for automatically substituting a reserve source of current, in association with a current impressing means, for a main source of current upon the improper functioning of the main source, such substitution being maintained independently of the switching means by an indicating control means. i

The nature of the invention will clearly appear from the following specification and the annexed drawing in which is shown, diagrammatically, one embodiment thereof as applied to a remotely controlled signaling system.

In the accompanying drawlng, a relay 5 and a condenser 6 are bridged across the incoming conductors 1 and 2 of a line circuit, which conductors may lead to 'a distant station, not shown, since it is unessential to a proper understanding of the inventlon', and are normally continued to conductor extensions 3 and 4 respectively, which may lead to any suitable signaling device. The

relay7 controlled byrelay 5, controls relay 8 for disconnecting the extensions 3 and 4. from their normal connection with conductorsl and 2 and for associatingtherewith the secondary winding either of transformer 15 or of transformer 16. Relay 7 also controls the operation of the buzzer or other interrupting device 9 in circuit with the primary winding of the transformer 16. Associated with buzzer 9, relays 10 and 11 cooperate to cause the operation of relay 18 upon the failure of buzzer 9 to operate. Relay 12, operating upon the operation of relay 18 and locking under the control of key 17, serves to maintain relay 18 under the direct control of relay 7. The buzzer or other signaling device 18 associated withrelay 12 and jointly controlled by key 17 serves to continuously indicate theoperated condition of relay 12.

It is thought that the invention will be more fully comprehended from the following description of the operation of the system shown.

Upon the receipt of an incoming call, signaling current impressed upon the line conductors 1 and 2 at the distant station, flows through relay 5 and condenser 6, causing the operation of relay 5. Relay 7 operates over a. circuit established from battery through the winding of relay 7 and the contact of relay 5 to ground. Relay 8 is also operated overa circuit established from battery,

through the winding of relay 8 and the contact of relay 7 to ground. The operation of relay 8 removes line conductor extensions 3 and 4: from their normal association with line conductors 1 and 2 respectively, and connects with such extensions through the normal contacts of relay 18 and the alternate contacts of relay 8, the secondary Winding of transformer 16. A circuit is also established from battery, through the contact and winding of buzzer 9, the primary winding of the transformer 16,.the windings of relays 11 and 10 in series, the middle normal contact of relayl2 and the contact of relay 7 to ground. Relay 10 and buzzer 9 oper ate over this circuit but due to aninsufli' cient amount of current flowing under such conditionsthrough such circuit, if buzzer 9 is operating in a proper manner, relayll does not operate. Thus, the alternating current induced in the secondary winding of transformer 16, by the interrupted current and the contact of relay 7 to ground.

flowing through the primary winding of such transformer, flows through the normal contacts of relay 18 and the alternatecontacts of relay 8 to the conductors 3 and 1, and causes the operation of any suitable signaling device which may be associated with such conductors. Upon the cessation of signaling current on theline, relays 5, 7 and 8 release, removing the secondary of transformer 16 from its association with the extensions 3 and hand'reestablishing these extensions in their normal association with line conductors 1 and 2 respectively.

In case buzzer 9 fails to operate in such a circuit the uninterrupted current flowing through relay 11 under such conditions is suflicient to cause the operation thereof, whereupon relay 18 operatesove'r a circuit established from battery through the winding of relay 18, the left-'handnormal contact of relay 12,,the alternate contact of relay 11, the alternatecontact of relay 10, the middle normal "contact of relay 12, and the contact of relay 7 to ground. By openingits normal contacts relay 18 removes the secondary winding of transformer 16 from its association with theline conductor extensions 3 and hand by closing its right-hand and middle alternate contacts, it connects the secondary winding of transformer 15 with such extensions in a similar-manner. The closure of theleft-hand alternate contact of relay'18 causes the operation of relay 12 over a circuit established from battery through the winding andthe right-hand norma-l contact of relay 12, the contact ofrelay 18 and the contact of relay 7 to ground. 'Buzzer 14 is operated over a circuit from battery throughthe contact and winding of buzzer 1 1, theprimary winding of transformer 15, the left hand alternate contact of relay 18 The alternating current thereupon induced in the secondary winding of transformer 15 due to the interrupted current in the pri mary winding of such transformer flows through the right-hand and middle alternate contacts of relay 18 and the alternate contacts of relay" 8 to the line conductor extensions 3 and 4 for operating the signaling deviceassociated with such extensions. Relay 12 locks in an operated condition over a circuit established from battery, through the winding and the right-hand alternate contact of relay 12 and the contact of key 17 to ground. Signaling buzzer 13 is also CO111J111110L1Sly operated overa circuit established from battery through the contact and winding of buzzer 18, the right hand alternate contact ofrelay 12 andthe contact of key l'f to ground. The audible signal produced by buzzer 18 serves to indicate the substitution ofthereserve source of signaling current assoclated with the transformer 15 instead of the mam source associated with transformer 16 due to the improper functioning of the buzzer 9. The attendant in response to the signal produced bybuzzer 13 may readjust buzzer 9 for proper operation and when such adjustment has been secured actuate key 17, thereby releasing relay 12 to cause the cessation of the signal produced by buzzer 13 and to remove relay 18 from the control of relay 7. However, as long as key 17 is unactuated, although relays 5, 7 and 8 release as before, and relay 18 releases, upon the removal of signaling current from the conductors l and 2,the winding of relay 18 is maintained in association with the contact ofrela y 7 due to the lockingof relay 12. Thus upon a subsequent application ofsignaling current to the line conductors '1 and 2, thereby causing the re-operation of relays 5, 7, 8 and '18 signaling current flows from the secondary winding of transformer 15 over the conductors 8 and 1. Also in case key 17 is actuated, before buzzer 9 is readjusted and after signaling current has been removed from conductors 1 and 2, although. buzzer 18 ceases to operate, relay 12 releases and rel'z'y 18 is removed from the direct control of relay 'l', nevertheless a subsequent applicationof signaling current will cause the sequence of operations previously described as occurring upon the improper functioning of buzzer 9, insuring that the current in duced in the secondary of transformer 15 flows over the conductors?) and 41-.

In case the contact of buzzer 9 fails to close thus removing the battery supply from the circuit including relays 10 and 11 thereby' releasing such relays, relay 18operates over a circuit extending from battery throughthe winding of relay 18, the left hand normal contact of relay 12,the normal contact of relay 10, the middle normal contact of relay 12 and the contact of relay 7 to ground. The other operations thereupon occur, as previously described in connection with the operation of relay 18.

1t will-be evident that by means of this invention, not only is the reserve source of current automatically brought into service by an indicating switching means upon the improper functioning of the main source but also such reserve source is maintained available for service under independently controlled means, thereby insuring that the main source will not be brought into serv ice until it is in condition to function properly. i

What is claimed is:

1. 'In a generating system, a transmission other source to the line, and means for maintaining such other source in associationwith the line.

2. In a generating system, a transmission line circuit, a source of current normally disconnected from the line, switching means for connecting said sourceto the line, another source of current, means controlled by said switching means to prevent the association of the first mentioned source therewith during the improper functioning of the source and to associate the other source therewith, and independently controlled means for maintaining such other source under the control of the switchingmeans.

3. In a generating system, a transmission line circuit, a source of current adapted for association therewith, controlling means associated with the line for connecting such source with the line, another source of current, switching means controlled by the inoperative condition of the first mentioned source for removing such source from the control of the first mentioned means and for placing the other source under the control of such means, independently controlled means for maintaining such other source under the control of the first mentioned means, and a signaling device controlled thereby.

4, In a generating system, a transmission line circuit, a relay associated therewith and responsive to current thereon, a source of current comprising a battery, an interrupter and a transformer, switching means controlled by the relay for connecting the source with the line, a second source of current, a marginal relay associated with the first mentioned source of current and operating upon the failure of operation of the interrupter, switching means controlled by the marginal relay for removing the first mentioned source from the control of the relay and to place the second mentioned source under control of such relay, an independently locking relay operated by the second mentioned switching means for maintaining the second source of current under such control, and a signaling device controlled by the locking relay.

5. In a generating system, a transmission line circuit, a relay associated therewith and responsive to current thereon, an interrupter, a source of current, a second relay controlled by the first mentioned relay for associating the interrupter and the source of current with the line, a marginal relay included in circuit with the interrupter and operating upon the failureof the interrupter tooperate, a second source of current, a switching relay controlled by the marginal relay for removing the interrupter and the first mentioned source of current from the line and for connecting the second mentioned source of current to the line, a locking relay for controlling the switching means, a signaling device controlled thereby, and a control key for the locking relay. 7

In witness whereof, I hereunto subscribe my name this 18th day of October, A. D., 1918.

CHARLES WHITE. 

